Drop-hammer.



No. 643,46l. Patented Feb. I3, I900.

F. ,F. BISCHOFF. DROP HAMMER.

{Application filed. Oct. 28, 1899.)

(No Model.) 3 Sheets-Sheet l.

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Patented Feb. I3, I900. F. F. BISCHUFF.

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3 Sheets-Sheat 2.

(No Model.)

No. 643,46]. Patented Feb. l3, I900. F. F. BISCHQFF. DROP HAMMER.

(Application filed Oct. 28, 1899.)

3 Sheets-Sheet 3.

(No Model.)

UNITED STATES PATENT OFFICE.

FREDERICK F. BISCHOFF, OF CHICAGO, ILLINOIS.

DROP-HAMMER.

SPECIFICATION forming art or Letters Patent N6. 643,461, dated. February13, 1900. Application filed omb'i 28, 1899. Serial No. 735,018. (Nomodel.)

To all whom, it may concern:

Be it known that I, FREDERICK F. BISCHOEF, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois,have invented certain new and useful Improvements inDrop-Hammers; and'I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to makeand use the same.

My invention relates to a novel construction in a drop-hammer, theobject being to provide a simple and efficient device of this characterin which the hammer can be raised to any desired height and released,thereby overcoming the objection usually presented in machines of thischaracter-via, that the stroke of the hammer must be adj usted andcannot be changed without stopping operations; and it consists in thefeatures of construction and combinations of parts hereinafter fullydescribed and claimed.

In the accompanying drawings, illustrating my invention, Figure 1 is afront elevation of my drop-hammer with a top cross-piece removed. Fig. 2is a top plan viewof same. Fig. 3 is a fragmentary vertical section onthe lines 3 3 of Figs. 1 and 2. Fig. 4 is a sectional view on the line 44 of Fig. 2. Figs. 5 and 6 are detail sectional views on the lines 5 5and 6 6, respectively, of Fig. 4.

Referring now to said drawings,A indicates a frame comprising twouprights 1, mounted upon a base 2. Between said uprights and upon saidbase a table or anvil 3 is mounted upon which the object to be subjectedto the action of the hammer 4 is laid. Said hammer 4 is Verticallymovable on guides 5 on said uprights 1 and is raised by means of a rope6, turned around a friction-drum 7, adapted to be clutched upon a shaft8, as follows: Said friction-drum 7 consists of two parallel disks 9,loosely mounted upon the shaft 8 and provided witha plurality of radialslots 10, in each of which the end 11 of a drum-segment 12 is slidinglyheld. Radial openings 13 are bored in each of said disks 9, whichintersect said radial slots 10. Each of said radial openings 13 containsa spring 14,which bears at its outer end against one of said ends 11 ofsaid segments 12, thus normally holding said segments at the outerlimits of their movement. Said rope 6 is given several turns around saiddrum and its other end is connected with a rope 15, coiled around adriveshaft 16, geared to said shaft 8, the other end of said rope 15depending loosely from said drive-shaft. A drum or collar 17 is rigidlymounted upon said shaftS between said disks 9, and upon the same saidsegments are adaptedto be forced to clutch the same,whereby saidsegmentdrum is set in motion. Said shaft 8 and drive-shaft 16 arejournaled in bearings 18 and 19, respectively mounted upon horizontalarms 20, carried by said uprights 1 and extending rearwardly therefrom,the rear ends of said arms being supported by braces 21. Cross-pieces 22connect said arms 20. By pulling upon the loose end of said rope 15 thesame is drawn tight or clutched upon said drive-shaft 16, therebycausing the latter to draw the other end connected with said rope 6toward it, thereby exerting a powerful pull on said rope 6 and drawingsame tightly over said segmental drum and contracting the latter toclutch said drum 17, thereby causing said segmental drum to turn inunison with said shaft 8 and raising said hammer 4. By releasing orslacking said loose end of said rope 15 the shaft 16 is released and therope 6 is likewise slacked, thereby releasing said segmental drum fromengagement with said drum 1'7 and permitting the hammer4 to drop. 'Bymeans of this arrangement the stroke of said hammer can be controlledand light or heavy blows administered at will.

I have also provided devices for supporting the hammer above the anvil 3to permit the material to be hammered to be adjusted. Said devicesconsist of levers 23, pivoted between their ends upon said uprights 1and adapted to project into the path of said hammer 4, the saidprojecting end portions being supported by lugs 24 on said standards.The outer ends of said levers 23 are pivotally connected with links 25,pivoted at their other ends to the ends of levers 26, pivoted betweentheir ends on the lower ends of said standards 1, the other ends of saidlevers 26 being connected by a rod 27. By depressing said rod 27 thesaid levers 23 are turned so that their inner ends project into the pathof said 11ammer 4.

I claim as my invention 1. In a drop-hammer, the combination with aframe and a hammer vertically movable therein, of a cord connected withsaid hammer at one end, a drum revolubly mounted upon. a shaft carriedby said frame and around which said cord is adapted to be wound, saiddrum being provided with devices adapted to be actuated by pulling onthe free end of said cord for clutching same fast with said shaft toraise said hammer.

2. In a drop-hammer, the combination with a frame and a hammervertically movable therein, of a cord connected with said hammer at oneend, a drum revolubly mounted upon a shaft carried by said frame andaround which said cord is adapted to be wound, a drum mounted rigidly onsaid shaft Within said firstnamed drum, said first-named drum beingprovided with a plurality of radiallymovable members adapted to beactuated by pulling on the free end of said cord and moved radiallyinwardly to engage said inner drum to clutch said first-named drum rigidwith said shaft, to raise said hammer.

In a drop-hammer, the combination with a frame and a hammer verticallymovable in said frame, of a shaft journaled in bearings on said frame, adrum loosely mounted on said shaft, a rope wound around said drum andconnected at one end with said hammer, a shaft geared to saidfirst-named shaft,a cord wound around said counter-shaft and connectedat one end with said rope and having its other end depending loosely,and devices actuated bythe tension of said rope for clutching said drumfast with said shaft to turn said drum whereby said hammer is raised,substantially as described.

4. In a drop-hammer, the combination with a frame and a hammervertically movable therein, of a shaft, a drum loosely mounted thereonand comprising two parallel disks and a plurality of radially-movablesegments mounted therein, and springs for normally holding said segmentsat the outer limits of their movement, a collar or drum rigidly mountedon said shaft between said disks upon which said segments are adapted tobear when moved radially inwardly, to clutch the same, and a rope woundaround said segmental drum and connected at one end with said hammer,whereby when said rope is drawn taut said segmental drum is clutchedfast with said shaft and said hammer is raised,substantially asdescribed.

5. In a drop-hammer, the combination with a frame and a hammervertically movable therein, of a shaft, a drum loosely mounted thereonand comprising two parallel disks and a plurality of radially-movablesegments mounted therein, and springs for normally holding said segmentsat the outer limits of their movement, a collar or drum rigidly mountedon said shaft between said disks upon which said segmeu ts are adaptedto hear when moved radiallyinwardly, to clutch the same, a cord woundaround said segmental drum and connected at one end with said hammer,and devices connected with the other end of said cord to aid theoperator to draw same taut to move said segments inwardly to clutch saidsegmental drum fast with said shaft, whereby said hammer is raised,substantially as described.

6. In a drop-hammer, the combination with a frame and a hammervertically movable therein, of a shaft, a drum loosely mounted thereonand comprising two parallel disks and a plurality of radially-movablesegments mounted therein, and springs for normally holding said segmentsat the outer limits of their movement, a collar or drum rigidly mountedon said shaft between said disks upon which said segments are adapted tohear when moved radially inwardly, to clutch the same, a shaft geared tosaid first-named shaft, a cord wound around said drum and connected atone end with said hammer, and a cord connected with the free end of saidfirst-named cord and wound around said last-named shaft, the other endof said last-named cord depending loosely from said last-named shaft,substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

FREDERICK F. BISCHOFF.

Witnesses:

E. F. WILSON, RUDOLPH WM. 1,01%.

